international standard norme internationale

IEC 60034-27-3
Edition 1.0 2015-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 27-3: Dielectric dissipation factor measurement on stator winding
insulation of rotating electrical machines
Machines électriques tournantes –
Partie 27-3: Mesure du facteur de dissipation diélectrique sur le système
d’isolation des enroulements statoriques des machines électriques tournantes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160
ISBN 978-2-8322-3061-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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– 2 – IEC 60034-27-3:2015 © IEC 2015
CONTENTS
FOREWORD ........................................................................................................................... 4
INTRODUCTION ..................................................................................................................... 6
1 Scope .............................................................................................................................. 7
2 Normative references ...................................................................................................... 7
3 Terms and definitions ...................................................................................................... 7
4 Theory and measuring techniques ................................................................................... 8
4.1 Dielectric dissipation factor measurement ............................................................... 8
4.2 Analogue Schering bridge ..................................................................................... 10
4.3 Transformer ratio arm bridge................................................................................. 11
4.4 Digital phase shift measurement ........................................................................... 12
5 Test procedures ............................................................................................................ 13
5.1 General ................................................................................................................. 13
5.2 Winding bars and coils .......................................................................................... 15
5.2.1 Test object preparation .................................................................................. 15
5.2.2 Guarding techniques ...................................................................................... 15
5.2.3 Measuring procedure ..................................................................................... 17
5.3 Complete windings ................................................................................................ 17
6 Test results ................................................................................................................... 18
6.1 General ................................................................................................................. 18
6.2 Winding bars and coils .......................................................................................... 19
6.3 Complete windings ................................................................................................ 20
7 Test report ..................................................................................................................... 21
7.1 General ................................................................................................................. 21
7.2 New coils, bars and winding .................................................................................. 21
7.3 Operational aged winding ..................................................................................... 22
Annex A (informative) Relationship between power factor and dissipation factor .................. 24
Bibliography .......................................................................................................................... 26
Figure 1 – Parallel circuit and vector diagram ......................................................................... 8
Figure 2 – Series circuit and vector diagram ........................................................................... 9
Figure 3 – Dielectric losses with increasing voltage (schematic) ........................................... 10
Figure 4 – High voltage Schering bridge – Basic circuit ......................................................... 11
Figure 5 – Transformer ratio arm bridge ................................................................................ 12
Figure 6 – Schematic test set-up of a digital dissipation factor measuring system with
principle current oscillogram ................................................................................................. 13
Figure 7 – Example of a curve of tan δ versus voltage ratio U/ UN measured in voltage
steps of 0,2 UN ...................................................................................................................... 14
Figure 8 – Arrangement with guard rings electrodes on test objects with insulation gap
(example of preferred insulation gap and guard ring electrode dimensions) .......................... 16
Figure 9 – Application of guard ring electrodes on top of stress control coating .................... 17
Figure A.1 – Phasor diagram ................................................................................................ 24
Table 1 – Maximum values of dielectric dissipation factor of single bars and coils in
new condition with guard ring electrodes up to a rated voltage of UN = 21 kV ........................ 19
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IEC 60034-27-3:2015 © IEC 2015 – 3 –
Table A.1 – Comparison between correlating values of dielectric power factor cos φ
and dielectric dissipation factor tan
δ and their difference ..................................................... 25
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– 4 – IEC 60034-27-3:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 27-3: Dielectric dissipation factor measurement on stator
winding insulation of rotating electrical machines
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote interna-
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International Standard IEC 60034-27-3 has been prepared by IEC technical committee 2:
Rotating machinery.
This first edition cancels and replaces the first edition of IEC TR 60894 published in 1987.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) digital measurement of dissipation factor and capacitance included;
b) limits for dissipation factor values given;
c) detailed description of measuring techniques;
d) extension of scope to complete windings.
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IEC 60034-27-3:2015 © IEC 2015 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
2/1803/FDIS 2/1804/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60034 series, published under the general title Rotating electrical
machines, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data re-
lated to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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